Example for getting performance timing from chrome

timing-loop.js

const puppeteer = require('puppeteer');

function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

async function requestPageTiming(url) {
    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    await page.goto("https://www.amazon.com");
    const performanceTiming = JSON.parse(
        await page.evaluate(() => JSON.stringify(window.performance.timing))
    );
    await browser.close();
    return performanceTiming;
}

async function runTests() {
    var urls = ["https://www.amazon.com", "https://www.google.com", "https://www.msn.com", "https://www.yahoo.com"];
    for (const url of urls) {
        await requestPageTiming("https://www.amazon.com").then((timingResult) => {
            console.log(timingResult);
        })
    }
}

runTests();